They're not a total duplicate, but they are different enough that they're not exactly a replacement, either.
It sounds, from what you indicated, that the first ones are too worn out to wear in social situations or at the office, let's say, so you'd might as well wear them when by yourself, for example, until they're totally unwearable.
I can see the second ones, though, only with pants. I can't see them with a skirt or dress, or shorts, while the first ones could easily go either way. That's why I can't consider them a total replacement.